Seiko Cal. 5648 - 740

This Hand-Winding model from 1980 features a 44mm Hardlex-Coated Steel case. It features a Green dial protected by a Acrylic crystal and offers 190m of water resistance. [seikata-wm-2c20813cb21b]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Green

Jewels

34j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1980

Related Models

• Seiko 5688-453
• Seiko 7053-807
• Seiko 6368-343
• Seiko 5624-812
• Seiko 4413-420
• Seiko 6356-496
• Seiko 6386-729
• Seiko 6223-442
• Seiko 6379-412
• Seiko 4496-209
• Seiko 3864-632
• Seiko 5653-150